Spatial coexistence of multiple modes in a nanogap spin Hall nano-oscillator with extended Pt/Ni/Fe trilayers

Chen, Lina; Wang, Wenqiang; Zhan, Xiang; Zhou, Kaiyuan; Gao, Zhenyu; Liang, Like; Zhou, Tiejun; Du, Youwei; Liu, R. H.

doi:10.1103/physrevb.105.104413

Cited by 5 publications

(1 citation statement)

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“…Here, the tones are intrinsically linked by rational numbers. Alternatively, mode hopping between nearly degenerate eigen-solutions have been reported (24)(25)(26) induced by thermal fluctuations (27), spatial inhomogeneity of the internal field in asymmetric ferromagnetic bilayers (28), or by formation of higher-order modes of excited magnetic solitons (29). Also, a high level of thermal fluctuations can result in a seemingly multimode generation that is just an amplification of the incoherent thermal population of higher modes.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous multitone microwave emission by dc-driven spintronic nano-element

Hamadeh,

Slobodianiuk,

Moukhader

et al. 2023

Sci. Adv.

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Current-induced self-sustained magnetization oscillations in spin-torque nano-oscillators (STNOs) are promising candidates for ultra-agile microwave sources or detectors. While usually STNOs behave as a monochromatic source, we report here clear bimodal simultaneous emission of incommensurate microwave oscillations in the frequency range of 6 to 10 gigahertz at femtowatt level power. These two tones correspond to two parametrically coupled eigenmodes with tunable splitting. The emission range is crucially sensitive to the change in hybridization of the eigenmodes of free and fixed layers, for instance, through a slight tilt of the applied magnetic field from the normal of the nanopillar. Our experimental findings are supported both analytically and by micromagnetic simulations, which ascribe the process to four-magnon scattering between a pair of radially symmetric magnon modes and a pair of magnon modes with opposite azimuthal index. Our findings pave the way for enhanced cognitive telecommunications and neuromorphic systems that use frequency multiplexing to improve communication performance.

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Section: Introductionmentioning

confidence: 99%

Simultaneous multitone microwave emission by dc-driven spintronic nano-element

Hamadeh,

Slobodianiuk,

Moukhader

et al. 2023

Sci. Adv.

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Current-driven magnetization dynamics and its correlation with magnetization configurations in perpendicularly magnetized tunnel junctions

Zhou

Chen

Chi³

et al. 2022

Journal of Applied Physics

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We study spin-transfer-torque-driven magnetization dynamics of a perpendicular magnetic tunnel junction nanopillar. Through the combined investigations on spin-torque ferromagnetic resonance and microwave spectroscopy, it is found that the free layer (FL) and the weak pinned reference layer (RL) exhibit distinct dynamic behaviors. First, frequency vs field dispersion for the FL and RL shows an opposite trend as the field varies. Second, the FL can support a single spin-wave (SW) mode for both parallel and antiparallel configurations, while the RL exhibits spin-wave excitation only for the antiparallel state. Those two SW modes coexist at the antiparallel state, and their oscillation frequency exhibits a crossover phenomenon with increasing the external magnetic field, which could be helpful in the mutual synchronization of auto-oscillations for SW-based neuromorphic computing.

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